Interview Questions

Bugs-1.js

function ajaxFindIndex(userIds, callback) {
  for (var i = 0; i < userIds.length; i++) {
		$.getJSON("http://some-api.com/get-user", { id: userIds[i] }, function (user) {
			if (callback(user))
				return i;
		});
	}
	return -1;
}

var userManager = {
	userIds: [1, 2, 3],
	highlightUser: function (index) { },
	searchField: 'name',
	search: function (searchText) {
		var index = ajaxFindIndex(this.userIds, function (u) {
			var corpus = u[this.searchField];
			return new RegExp(searchText, 'i').test(corpus));
		});
		this.highlightUser(index);
	}
};

gistfile1.txt

escape("SELECT user_id FROM user WHERE email = " + email);

the-great-escape.js

var userInput = prompt(...);
var htmlSource = "<h1>Contents...</h1>"
 + "<script>$('h1').click(function() { $(this).html(" + userInput + "); });</script>";

https://github.com/jquery/jquery/blob/master/src/core.js#L265-L327